It's great to see others invest in fast CI as well! Amazing product, quite similar to our stack. We're using Firecracker (fly.io Machines) and Podman to build docker containers. Our baseline is 13 seconds to deploy a change, including git clone and docker push (4s usually). Here's a link to a short video: https://wundergraph.com/blog/wundergraph_cloud_announcement#...
We're soon going to post a blog on how we've built this pipeline. Lots on interesting details to share on how to make docker builds fast.